/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations;

import java.security.PublicKey;
import java.security.cert.X509Certificate;


import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
import com.sun.org.apache.xml.internal.security.keys.content.keyvalues.RSAKeyValue;
import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi;
import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import org.w3c.dom.Element;

public class RSAKeyValueResolver extends KeyResolverSpi {

  /**
   * {@link org.apache.commons.logging} logging facility
   */
  private static java.util.logging.Logger log =
      java.util.logging.Logger.getLogger(RSAKeyValueResolver.class.getName());


  /**
   * @inheritDoc
   */
  public PublicKey engineLookupAndResolvePublicKey(
      Element element, String BaseURI, StorageResolver storage
  ) {
    if (log.isLoggable(java.util.logging.Level.FINE)) {
      log.log(java.util.logging.Level.FINE, "Can I resolve " + element.getTagName());
    }
    if (element == null) {
      return null;
    }

    boolean isKeyValue = XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_KEYVALUE);
    Element rsaKeyElement = null;
    if (isKeyValue) {
      rsaKeyElement =
          XMLUtils.selectDsNode(element.getFirstChild(), Constants._TAG_RSAKEYVALUE, 0);
    } else if (XMLUtils.elementIsInSignatureSpace(element, Constants._TAG_RSAKEYVALUE)) {
      // this trick is needed to allow the RetrievalMethodResolver to eat a
      // ds:RSAKeyValue directly (without KeyValue)
      rsaKeyElement = element;
    }

    if (rsaKeyElement == null) {
      return null;
    }

    try {
      RSAKeyValue rsaKeyValue = new RSAKeyValue(rsaKeyElement, BaseURI);

      return rsaKeyValue.getPublicKey();
    } catch (XMLSecurityException ex) {
      if (log.isLoggable(java.util.logging.Level.FINE)) {
        log.log(java.util.logging.Level.FINE, "XMLSecurityException", ex);
      }
    }

    return null;
  }

  /**
   * @inheritDoc
   */
  public X509Certificate engineLookupResolveX509Certificate(
      Element element, String BaseURI, StorageResolver storage
  ) {
    return null;
  }

  /**
   * @inheritDoc
   */
  public javax.crypto.SecretKey engineLookupAndResolveSecretKey(
      Element element, String BaseURI, StorageResolver storage
  ) {
    return null;
  }
}
